A surgical technique designed to preserve proprioceptive signals after amputation should allow patients to sense the location of their prostheses, feedback that is often compromised by convential surgery.

Harvard Puzzles by John de Cuevas

To simply say that the White Cliffs of Dover are made of chalk would miss the point of Life at the Edge of Sight: A Photographic Exploration of the Microbial World. The chalk giving the famous cliffs their white appearance was formed from the exoskeletons of plated marine microbes called coccolithophores.

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Graduate School of Arts and Sciences Medalists

Each June, the Graduate School of Arts and Sciences Centennial Medal, first awarded in 1989 on the occasion of the hundredth anniversary of the school’s founding, honors alumni who have made contributions to society that emerged from their graduate study at Harvard. This year’s honorands are, from left, Nobel Prize-winner and former Faculty of Arts and Sciences dean A. Michael Spence, Ph.D. ’72, a leader in both economics and higher-education administration; MIT professor Michael Artin, Ph.D. ’60, an architect of the modern approach to algebraic geometry; Elaine H. Pagels, Ph.D. ’70, an expert on the origins of Christianity; and Nobel Prize-winner H. Robert Horvitz, Ph.D. ’74, a molecular biologist who has done foundational work in the study of cell apoptosis.